Bobbin with lead strain-relieving device

ABSTRACT

The invention relates to a bobbin having means for securing the wire leading from the bobbin to prevent any strain being placed on the coil wound on the bobbin.

1 v United States 'atent inventor Thomas J. Wright 1tasca,lll.

Appl, No. 761,157

Filed Sept. 20, 1968 Patented Nov. 23, 1971 Assignee BeI-TronicsCorporation Addison, Ill.

BOBBIN WITH LEAD STRAIN-RELIEVING DEVICE 9 Claims, 5 Drawing Figs.

US. Cl 242/1252, 24/130, 242/851 Int. Cl Bh /28, B65h 75/36 Field 01Search 242/1252,

125.1,125.3,125,118.4,118.7,ll8.8,118,100, 85.1,77;24/129,130,129.1,129B

References Cited UNITED STATES PATENTS 9/1907 Jodrey 242/1252 6/1913Tobin 24/130 UX 7/1925 Ovellet.... 24/130 6/1940 Lyons 242/851 X 2/1912Schmucker 242/851 12/1930 Griswold 242/ 7/1954 Criswell... 242/851 X5/1962 Walker 242/1252 X Primary Examiner-George F. MautzAnorneyPetherbridge, ONeill & Lindgren ABSTRACT: The invention relatesto a bobbin having means for securing the wire leading from the bobbinto prevent any strain being placed on the coil wound on the bobbin,

BOBBIN WITI-I LEAD STRAIN-RELIEVING DEVICE As is known, in theproduction of electrical coils the wire forming the coil is wound arounda core or bobbin with the ends of the wire extending from the coil forsubsequent connection to the associated electrical connections orterminals. Frequently, when the ends of the wire are handled, ormanipulated, in connecting to the associated electrical terminals, thewires are pulled causing a strain to be placed on the coil.

Accordingly, it is a principal object of the invention to provide abobbin having means for preventing or minimizing any strain on the coilas the coil wire ends are handled or connected to the associatedcircuitry.

The invention will be more fully understood from the following moreparticular description of preferred embodiments of the invention, asillustrated in the accompanying drawings:

FIG. 1 shows a plan view of the bobbin in accordance with the invention;

FIG. 2 shows a front view of the bobbin of FIG. 1;

FIG. 3 shows a side view of the bobbin of FIG. 1;

FIG. 4 shows a partial enlarged view of the bobbin of FIGS. 1-3,indicating by the dotted lines the positioning of the wire in the bobbinto prevent strain from being placed on the coil; and,

FIG. 5 shows a modification of the bobbin of FIGS. 1-4.

Referring now to the drawings, and first, particularly to FIGS. 1-4, thenumeral 11 designates a bobbin of an electrical insulating material suchas, for example, nylon, and having a pair of spaced projecting flanges13 and 14 straddling an essentially hollow core or sleeve 15 upon whicha wire is to be wound for forming an electrical coil or winding.

The flanges 13 and 14 include extending projections or ears 17 and 18,respectively; and, each ear is bifurcated or divided into two portions.For example, ear 18 is divided into two portions 19 and 21, separated bya slot 23 extending from the edge of the ear in toward the edge of theflange 14. In addition, the portions 19 and 21 include slots 25 and 27,respectively, extending from the top and bottom of the car 18 inwardlythrough a slightly restricted throat to form a pocket or recess forreceiving a wire as will be explained hereinafter.

Referring now to FIG. 4, one end A of the wire 30 forming the coil 32 onbobbin 11 extends from the bobbin 11 for connection to the associatedelectronic circuitry. Wire 30 is arranged to lead from the coil 32through the pocket 27 outwardly to the exterior side of ear 19 on flange14, back through the slot 23 to the interior side of car 21, andoutwardly through pocket 25 to the exterior side of ear 21. Thus, theend 30A of wire 30 winds in serpentine fashion through the pocket 27,slot 23 and pocket 25 to retain or restrain wire 30.

Accordingly, tensile forces applied to the wire 30 will be absorbed orreacted by the ears 19 and 21 and will not be transmitted to the portionof the wire forming the coil 32.

The other end of the wire 30, not shown, is retained or restrained inflange l7 similarly to the manner in which end 30A of wire 30 isretained or restrained in flange 18.

A modification of the inventive bobbin is shown in FIG. 5 wherein abobbin 33 includes two spaced flanges 35 and 37 straddling a core 39.The flanges 35 and 37 are formed essentially in a closed U or shieldshape with outstanding cars 41 and 43 being formed on the straightportion of the shield Each of the cars 41 and 43 has two pockets and aslot similar in construction to the ears l7 and 18 of the bobbin ofFIGS. 14.

Note slot 23A and the pockets 25A and 27A similar respectively to slot23 and pockets 25 and 27 in ear 18.

The ears 41 and 43 of the bobbin of FIG. 5 are similar in function andmode of utilization as are the ears of bobbin 11 shown in FIGS. 1-4.

While the invention has been particularly shown and described withreference to a preferred embodiment thereof, it will be understood bythose skilled in the art that changes in form and details may be madetherein without departing from the spirit and scope of the invention.

1 claim:

1. A bobbin for supporting a wire coil comprising a coil-supporting corehaving a flange carried on the end thereof,

said flange having an ear portion extending outwardly therefrom,

said ear portion having a plurality of apertures for securing a coilwire passed therethrough in a serpentine fashion to prevent tensileforces applied to said wire from being transmitted to the coil,

wherein said plurality of apertures of said ear portion comprise acenter slot bifurcating the ear portion, and

an inwardly extending slot formed in each bifurcated ear portiondirected transverse to said center slot.

2. The apparatus of claim 1 including a coil of wire supported on saidcore and having each of oppositely extending ends thereof passingthrough said plurality of apertures on one of said ear portions in aserpentine fashion to prevent transmittal of tensile forces to saidcoil.

3. The apparatus of claim 1 including a coil of wire supported on saidcore and having one end thereof passing through an inwardly extendingslot over a bifurcated ear portion, through said center slot, over theopposite bifurcated ear portion and through the opposite inwardlyextending slot securing the coil end from transmitting tensile forces tothe coil.

4. The apparatus of claim 3 wherein the wire-engaging portion of saidinwardly extending slots terminates in a recess portion having a widthgreater than the slot channel width.

5. A bobbin as in claim 1 wherein said flange is formed in the shape ofa shield, and said ear portion extends outwardly from the flat edge ofthe shield.

6. In a bobbin for supporting a wire coil having a coil-supporting corewith a flange carried on the end thereof and a strain-relieving meanscarried by said flange for preventing tensile forces applied to the wirefrom being transmitted to the coil, the improvement wherein saidstrain-relieving means comprises a center slot defined in said flangeextending inwardly toward said coil-supporting core, and

a pair of slots formed in said flange each extending parallel to saidcoil-supporting core and directed inwardly toward said center slot forsecuring a coil wire passed therethrough preventing tensile forcesapplied to the wire from being transmitted to the coil.

7. The apparatus of claim 6 wherein the pair of slots formed in saidflange each extending parallel to said coil-supporting core and directedinwardly toward said center slot terminate in a recess portion having awidth greater than the slot channel width.

8. A bobbin as in claim 6 formed of a plastic material wherein said coreis elongated and said flanges are circular.

9. The apparatus of claim 6 wherein a flange is carried by each end ofsaid coil-supporting core.

1. A bobbin for supporting a wire coil comprising a coilsupporting corehaving a flange carried on the end thereof, said flange having an earportion extending outwardly therefrom, said ear portion having aplurality of apertures for securing a coil wire passed therethrough in aserpentine fashion to prevent tensile forces applied to said wire frombeing transmitted to the coil, wherein said plurality of apertures ofsaid ear portion comprise a center slot bifurcating the ear portion, andan inwardly extending slot formed in each bifurcated ear portiondirected transverse to said center slot.
 2. The apparatus of claim 1including a coil of wire supported on said core and having each ofoppositely extending ends thereof passing through said plurality ofapertures on one of said ear portions in a serpentine fashion to preventtransmittal of tensile forces to said coil.
 3. The apparatus of claim 1including a coil of wire supported on said core and having one endthereof passing through an inwardly extending slot over a bifurcated earportion, through said center slot, over the opposite bifurcated earportion and through the opposite inwardly extending slot securing thecoil end from transmitting tensile forces to the coil.
 4. The apparatusof claim 3 wherein the wire-engaging portion of said inwardly extendingslots terminates in a recess portion having a width greater than theslot channel width.
 5. A bobbin as in claim 1 wherein said flange isformed in the shape of a shield, and said ear portion extends outwardlyfrom the flat edge of the shield.
 6. In a bobbin for supporting a wirecoil having a coil-supporting core with a flange carried on the endthereof and a strain-relieving means carried by said flange forpreventing tensile forces applied to the wire from being transmitted tothe coil, the improvement wherein said strain-relieving means comprisesa center slot defined in said flange extending inwardly toward saidcoil-supporting core, and a pair of slots formed in said flange eachextending parallel to said coil-supporting core and directed inwardlytoward said center slot for securing a coil wire passed therethroughpreventing tensile forces applied to the wire from being transmitted tothe coil.
 7. The apparatus of claim 6 wherein the pair of slots formedin said flange each extending parallel to said coil-supporting core anddirected inwardly toward said center slot terminate in a recess portionhaving a width greater than the slot channel width.
 8. A bobbin as inclaim 6 formed of a plastic material wherein said core is elongated andsaid flanges are circular.
 9. The apparatus of claim 6 wherein a flangeis carried by each end of said coil-supporting core.